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A020634 Smallest nonempty set S containing prime divisors of 10k+4 for each k in S. 0
2, 3, 7, 11, 13, 17, 19, 23, 29, 31, 37, 47, 67, 71, 73, 79, 97, 127, 157, 167, 197, 241, 337, 367, 397, 487, 523, 569, 787, 1741, 1987, 2437, 2617, 8707 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..34.

CROSSREFS

Cf. A020596. [From R. J. Mathar, Oct 25 2008]

Sequence in context: A178943 A038613 A075235 * A173555 A086339 A333364

Adjacent sequences:  A020631 A020632 A020633 * A020635 A020636 A020637

KEYWORD

nonn,fini,full

AUTHOR

David W. Wilson

STATUS

approved

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Last modified May 16 14:13 EDT 2021. Contains 343949 sequences. (Running on oeis4.)